qs: I'm not sure. It's hard to predict how much he'd contribute with in pure numbers. He's on the rise as a winger though. You would expect him to score more next season than he did the last. Maybe the step up is too big for next season in a new league, but he'll make it the season after that instead if that's the case. It strikes me as a good investment either way.
Looking at Arsenal right now we have a lot of fairly reliable wide players, but only Chamberlain who regularly takes players on when he plays on the flank. I'd kill for someone who knows how to dribble out there.